Free Online Resources: Past Papers & MCQs for PN Cadet Physics Tests
PN Cadet Physics Tests (Part-2)
21. Which of the following has the highest energy?
A. Gamma rays
B. X-rays
C. Ultra-violet radiation
D. radio waves
Correct Answer: A. Gamma rays
22. Which of the following has the largest wavelength?
A. visible light
B. x-rays
C. infrared light
D. ultraviolet radiation
Correct Answer: A. visible light
23. Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to greatest energy?
A. radio, visible, infrared, ultraviolet, x-ray, gamma ray
B. radio, infrared, visible, x-ray, gamma ray, ultraviolet
C. visible, radio, infrared, ultraviolet, x-ray, gamma ray
D. radio, infrared, visible, ultraviolet, x-ray, gamma ray
Correct Answer: D. radio, infrared, visible, ultraviolet, x-ray, gamma ray
24. According to the definition of 1 KWh, a 100 watt bulb consumes one unit of electricity in ______?
A. 1 hours
B. 5 hours
C. 10 hours
D. 15 hours
Correct Answer: C. 10 hours
25. Which of the following is closest to a yard in length?
A. 0.01m
B. 0.1m
C. 1m
D. 10m
E. 100m
Correct Answer: C. 1m
26. The average speed of a moving object during a given interval of time is always:
A. the magnitude of its average velocity over the interval
B. the distance covered during the time interval divided by the time interval
C. one-half its speed at the end of the interval
D. its acceleration multiplied by the time interval
E. one-half its acceleration multiplied by the time interval
Correct Answer: B. the distance covered during the time interval divided by the time interval
27. All of the following statements are incorrect except:
A. Precision and accuracy should go side by side in a scientific work
B. Scientific work must be precise, accuracy is not essential
C. Scientific work must be accurate, precision is not essential
D. Calculations must be made before any experiment
Correct Answer: A. Precision and accuracy should go side by side in a scientific work
28. Two automobiles are 150 kilometers apart and traveling toward each other. One automobile is moving at 60km/h and the other is moving at 40km/h mph. In how many hours will they meet?
A. 2.5
B. 2.0
C. 1.75
D. 1.5
E. 1.25
Correct Answer: D. 1.5
29. An atom is ______?
A. smallest indivisible particle in an element
B. smallest particle of an element which can undergo a chemical reaction
C. building block of an element
D. always smaller than a molecule
Correct Answer: B. smallest particle of an element which can undergo a chemical reaction
30. Which of the following is a substance?
A. Sea water
B. Brass
C. Tape water
D. Graphite
E. Sand
Correct Answer: D. Graphite
31. All of the following substances are crystalline except ______?
A. Ice
B. Diamond
C. Sucrose
D. Plastic
Correct Answer: D. Plastic
32. Rate of evaporation of petrol is greater than that of water at room temperature because:
A. Petrol molecules do not have any hydrogen bond
B. Petrol is an organic compound
C. Water molecules have small size
D. Petrol molecules have greater size
Correct Answer: A. Petrol molecules do not have any hydrogen bond
33. The increasing vapor pressure caused by heating a liquid is due to ______?
A. Increase inter-molecular interactions
B. Increasing the potential energy of molecules
C. Increasing kinetic energy of molecules
D. Decreasing surface tension
Correct Answer: C. Increasing kinetic energy of molecules
34. Covalent network crystals have ______?
A. Higher melting point than molecular crystals
B. Lower melting point than molecular crystals
C. Discrete molecules linked by Van der Waals forces
D. Hydrogen bonding
Correct Answer: A. Higher melting point than molecular crystals
35. Color of the glow produced in the discharge tube:
A. Depends on the pressure in the discharge tube
B. Depends on the metal used as the cathode
C. Depends on the gas used in the discharge tube
D. Does not depend on the nature of the gas used in the discharge tube
Correct Answer: C. Depends on the gas used in the discharge tube
36. Nuclear radiation is emitted by those elements whose:
A. Molecules are stable
B. Molecules are unstable
C. Nuclei are stable
D. Nuclei are unstable
Correct Answer: D. Nuclei are unstable
37. Second ionization energy:
A. Is always less than first ionization energy
B. Is always greater than first ionization energy
C. Is equal to the first ionization energy
D. May be greater or less than the first ionization energy depending on the nature of the element
Correct Answer: B. Is always greater than first ionization energy
38. All of the following are electromagnetic radiations except ______?
A. Red light
B. Sound waves
C. X-Rays
D. Photon
Correct Answer: B. Sound waves
39. A glass chimney stops an oil lamp from smoking because:
A. It increases the supply of oxygen to the flame by convection
B. The heat produced ensures complete combustion
C. Both of these
D. Neither of these
Correct Answer: C. Both of these
40. What Is Used To Measure Velocity?
A. Speedometer
B. Anemometer
C. Odometer
D. Hygrometer
Correct Answer: A. Speedometer
